EP0320762A2 - Process for the preparation of a chiral, stereorigid metallocen compound - Google Patents

Process for the preparation of a chiral, stereorigid metallocen compound Download PDF

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EP0320762A2
EP0320762A2 EP88120401A EP88120401A EP0320762A2 EP 0320762 A2 EP0320762 A2 EP 0320762A2 EP 88120401 A EP88120401 A EP 88120401A EP 88120401 A EP88120401 A EP 88120401A EP 0320762 A2 EP0320762 A2 EP 0320762A2
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indenyl
compound
formula
chiral
r1r2si
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EP0320762A3 (en
EP0320762B1 (en
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Jürgen Dr. Rohrmann
Wolfgang Anton Prof. Dr. Hermann
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Hoechst AG
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Hoechst AG
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F17/00—Metallocenes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S526/943—Polymerization with metallocene catalysts

Definitions

  • the present invention relates to a process for the preparation of chiral, stereorigid metallocene compounds of tital, zircon and hafnium.
  • Chiral, stereorigid metallocene compounds, together with special cocatalysts such as aluminoxanes, are highly active stereospecific catalysts for the production of highly isotactic polypropylene.
  • the chiral compounds can be used as a racemate, but they must not be in the meso form, since this form shows no stereospecificity.
  • Catalysts consist of substituted mono-, di- and tricyclopentadienyl coordination complexes of transition metals and aluminoxanes (cf. EP-A 129 368). They are used to produce polyolefins with a defined molecular weight. Nothing is said in this document about the production of the transition metal complexes.
  • silyl-bridged metallocene compounds can be obtained in almost pure racemic form by reacting an alkali salt of a silylindenyl compound with a titanium, zirconium or hafnium halide at a low temperature.
  • the invention thus relates to a method for producing a chiral, stereorigid metallocene compound of the formula I.
  • [R1R2Si (indenyl) 2 [Me2X2 (I), wherein R1 and R2 are the same or different and are a C1 to C20 alkyl group, a C2 to C20 alkenyl group, a C6 to C20 aryl group, a C7 to C20 alkylaryl group or a C7 to C20 aralkyl group, Me2 is titanium, zircon or hafnium and X represents a halogen atom, characterized in that a compound of the formula II [R1R2Si (indenyl) 2] Me (II), wherein R1 and R2 have the meaning given above and Me1 is an alkali metal, with a compound of formula III Me2X4 (III), wherein Me2 and X have the meaning given above, at a temperature of -78 ° C to +25
  • a silyl compound of the formula II is used for the process according to the invention [R1R2Si (indenyl) 2] Me (II).
  • Me1 is an alkali metal, preferably lithium.
  • R1 and R2 are the same or different and are C1- to C20-, preferably C1- to C6-alkyl, C2- to C20-, preferably C2- to C6-alkenyl, C6- to C20-, preferably C6- to C12-aryl , C7 to C20, preferably C7 to C10 alkylaryl, C7 to C20, preferably C7 to C10 aralkyl, in particular R1 and R2 are methyl or phenyl.
  • Li2 [(CH3) 2Si (indenyl) 2] is particularly preferably used.
  • the compound of formula II is reacted with a compound of formula III Me2X4 (III), wherein Me2 is titanium, zircon or hafnium, preferably zircon or hafnium, and X is a halogen atom, preferably chlorine.
  • Me2 is titanium, zircon or hafnium, preferably zircon or hafnium
  • X is a halogen atom, preferably chlorine.
  • metal halides are used either as such or as solvate complexes, for example with tetrahydrofuran.
  • the solvents must be free of moisture and oxygen.
  • the reaction is carried out in an inert solvent.
  • suitable solvents are aromatic hydrocarbons such as toluene, xylene, aliphatic hydrocarbons such as hexane, pentane, or ethers such as diethyl ether, tetrahydrofuran, dioxane. Toluene, diethyl ether and tetrahydrofuran are preferably used.
  • the reaction temperature is -78 ° C to +25 ° C, preferably -40 ° C to 0 ° C.
  • the reaction time is 10 to 1000, preferably 60 to 180, minutes.
  • the reaction is carried out with stirring and in an inert gas atmosphere.
  • the process according to the invention has the advantage that the silyl-bridged metallocene compounds are formed in the racemic form and contain no or only very small proportions of the meso form. This is particularly important when using the complexes as catalysts, for example in the polymerization of ⁇ -olefins, since only the racemic form, but not the meso form, shows stereoselectivity. For example, while rac- [C2H4 (indenyl) 2] TiCl2 provides highly isotactic polypropylene, its meso form only produces atactic polymer.

Abstract

Durch Umsetzung einer Silylindenylverbindung der Formel II [R¹R²Si(indenyl)2]Me ? (II) (Me¹ = Alkalimetall) mit einem Titan- Zirkon- oder Hafniumtetrahalogenid erhält man eine chirale, stereorigide Metallocenverbindung der Formel I [R¹R²Si(indenyl)2]Me²X2 (I) (Me² = Ti, Zr, Hf), welche als fast reines Racemat anfällt und als Katalysatorkomponente für die Polymerisation von 1-Olefinen dienen kann.By reacting a silylindenyl compound of the formula II [R¹R²Si (indenyl) 2] Me? (II) (Me¹ = alkali metal) with a titanium, zirconium or hafnium tetrahalide gives a chiral, stereorigid metallocene compound of the formula I [R¹R²Si (indenyl) 2] Me²X2 (I) (Me² = Ti, Zr, Hf), which as almost pure racemate is obtained and can serve as a catalyst component for the polymerization of 1-olefins.

Description

Die vorliegende Erfindung bezieht sich auf ein Verfahren zur Herstellung von chiralen, stereorigiden Metallocen-­Verbindungen von Tital, Zirkon und Hafnium.The present invention relates to a process for the preparation of chiral, stereorigid metallocene compounds of tital, zircon and hafnium.

Chirale, stereorigide Metallocen-Verbindungen sind zusammen mit speziellen Cokatalysatoren, wie beispielsweise Aluminoxanen, hochaktive stereospezifische Katalysatoren zur Herstellung von hochisotaktischem Polypropylen. Die chiralen Verbindungen können hierbei als Racemat eingesetzt werden, sie dürfen jedoch nicht als meso-Form vorliegen, da diese Form keine Stereospezifität zeigt.Chiral, stereorigid metallocene compounds, together with special cocatalysts such as aluminoxanes, are highly active stereospecific catalysts for the production of highly isotactic polypropylene. The chiral compounds can be used as a racemate, but they must not be in the meso form, since this form shows no stereospecificity.

Es besteht Interesse daran, eine Verbindung des Typs [(CH₃)₂Si(indenyl)₂]ZrCl₂ für die Polymerisation von 1-Olefinen zu verwenden. Es war jedoch bislang nicht möglich, eine derartige Verbindung in Form des reinen Racemats zu gewinnen. Bei allen Versuchen wurde stets eine Mischung mit der meso-Form erhalten.There is interest in using a compound of the type [(CH₃) ₂Si (indenyl) ₂] ZrCl₂ for the polymerization of 1-olefins. However, it has so far not been possible to obtain such a compound in the form of the pure racemate. In all experiments, a mixture with the meso form was always obtained.

Bekannt sind Katalysatoren, welche aus substituierten Mono-, Di- und Tricyclopentadienyl-Koordinationskomplexen von Übergangsmetallen und Aluminoxanen bestehen (vgl. EP-A 129 368). Sie dienen zur Herstellung von Polyolefinen mit definierter Molmasse. Über die Herstellung der Übergangsmetallkomplexe wird in dieser Druckschrift nichts gesagt.Catalysts are known which consist of substituted mono-, di- and tricyclopentadienyl coordination complexes of transition metals and aluminoxanes (cf. EP-A 129 368). They are used to produce polyolefins with a defined molecular weight. Nothing is said in this document about the production of the transition metal complexes.

Nunmehr wurde gefunden, daß man silylverbrückte Metallocen-­Verbindungen in nahezu reiner racemischer Form erhält, wenn man ein Alkalisalz einer Silylindenylverbindung mit einem Titan-, Zirkon- oder Hafniumhalogenid bei einer tiefen Temperatur umsetzt.It has now been found that silyl-bridged metallocene compounds can be obtained in almost pure racemic form by reacting an alkali salt of a silylindenyl compound with a titanium, zirconium or hafnium halide at a low temperature.

Die Erfindung betrifft somit ein Verfahren zur Herstellung einer chiralen, stereorigiden Metallocen-Verbindung der Formel I
[R¹R²Si(indenyl)₂[Me²X₂      (I),
worin R¹ und R² gleich oder verschieden sind und eine C₁-­bis C₂₀-Alkylgruppe, eine C₂- bis C₂₀-Alkenylgruppe, eine C₆- bis C₂₀-Arylgruppe, eine C₇- bis C₂₀-Alkylarylgruppe oder eine C₇- bis C₂₀-Aralkylgruppe bedeuten, Me² Titan, Zirkon oder Hafnium ist und X ein Halogenatom bedeutet, dadurch gekennzeichnet, daß eine Verbindung der Formel II
[R¹R²Si(indenyl)₂]Me

Figure imgb0001
      (II),
worin R¹ und R² die obengenannte Bedeutung haben und Me¹ ein Alkalimetall ist, mit einer Verbindung der Formel III
Me²X₄      (III),
worin Me² und X die obengenannte Bedeutung haben, bei einer Temperatur von -78 °C bis +25 °C in einem inerten Lösemittel während 10 bis 1000 min umgesetzt wird.The invention thus relates to a method for producing a chiral, stereorigid metallocene compound of the formula I.
[R¹R²Si (indenyl) ₂ [Me²X₂ (I),
wherein R¹ and R² are the same or different and are a C₁ to C₂₀ alkyl group, a C₂ to C₂₀ alkenyl group, a C₆ to C₂₀ aryl group, a C₇ to C₂₀ alkylaryl group or a C₇ to C₂₀ aralkyl group, Me² is titanium, zircon or hafnium and X represents a halogen atom, characterized in that a compound of the formula II
[R¹R²Si (indenyl) ₂] Me
Figure imgb0001
(II),
wherein R¹ and R² have the meaning given above and Me¹ is an alkali metal, with a compound of formula III
Me²X₄ (III),
wherein Me² and X have the meaning given above, at a temperature of -78 ° C to +25 ° C in an inert solvent for 10 to 1000 min.

Für das erfindungsgemäße Verfahren wird eine Silylverbindung der Formel II eingesetzt
[R¹R²Si(indenyl)₂]Me

Figure imgb0002
      (II).
In dieser Formel ist Me¹ ein Alkalimetall, vorzugsweise Lithium. R¹ und R² sind gleich oder verschieden und bedeuten C₁- bis C₂₀-, vorzugsweise C₁- bis C₆-Alkyl, C₂- bis C₂₀-, vorzugsweise C₂- bis C₆-Alkenyl, C₆- bis C₂₀-, vorzugsweise C₆- bis C₁₂-Aryl, C₇- bis C₂₀-, vorzugsweise C₇- bis C₁₀-­Alkylaryl, C₇- bis C₂₀-, vorzugsweise C₇- bis C₁₀-Aralkyl, insbesondere bedeuten R¹ und R² Methyl oder Phenyl. Besonders bevorzugt wird Li₂[(CH₃)₂Si(indenyl)₂] eingesetzt.A silyl compound of the formula II is used for the process according to the invention
[R¹R²Si (indenyl) ₂] Me
Figure imgb0002
(II).
In this formula, Me¹ is an alkali metal, preferably lithium. R¹ and R² are the same or different and are C₁- to C₂₀-, preferably C₁- to C₆-alkyl, C₂- to C₂₀-, preferably C₂- to C₆-alkenyl, C₆- to C₂₀-, preferably C₆- to C₁₂-aryl , C₇ to C₂₀, preferably C₇ to C₁₀ alkylaryl, C₇ to C₂₀, preferably C₇ to C₁₀ aralkyl, in particular R¹ and R² are methyl or phenyl. Li₂ [(CH₃) ₂Si (indenyl) ₂] is particularly preferably used.

Die Verbindung der Formel II wird umgesetzt mit einer Ver­bindung der Formel III
Me²X₄      (III),
worin Me² Titan, Zirkon oder Hafnium, vorzugsweise Zirkon oder Hafnium, und X ein Halogenatom, vorzugsweise Chlor, sind. Diese Metallhalogenide werden entweder als solche oder als Solvatkomplexe, beispielsweise mit Tetrahydrofuran, verwendet. Die Lösemittel müssen frei von Feuchtigkeit und Sauerstoff sein.The compound of formula II is reacted with a compound of formula III
Me²X₄ (III),
wherein Me² is titanium, zircon or hafnium, preferably zircon or hafnium, and X is a halogen atom, preferably chlorine. These metal halides are used either as such or as solvate complexes, for example with tetrahydrofuran. The solvents must be free of moisture and oxygen.

Die Reaktion wird in einem inerten Lösemittel durchgeführt. Geeignete Lösemittel sind aromatische Kohlenwasserstoff wie beispielsweise Toluol, Xylol, aliphatische Kohlenwasserstoffe wie beispielsweise Hexan, Pentan, oder Ether wie beispielsweise Diethylether, Tetrahydrofuran, Dioxan. Vorzugsweise werden Toluol, Diethylether und Tetrahydrofuran verwendet.The reaction is carried out in an inert solvent. Suitable solvents are aromatic hydrocarbons such as toluene, xylene, aliphatic hydrocarbons such as hexane, pentane, or ethers such as diethyl ether, tetrahydrofuran, dioxane. Toluene, diethyl ether and tetrahydrofuran are preferably used.

Die Reaktionstemperatur beträgt -78 °C bis +25 °C, vorzugsweise -40 °C bis 0 °C.The reaction temperature is -78 ° C to +25 ° C, preferably -40 ° C to 0 ° C.

Die Reaktionszeit beträgt 10 bis 1000, vorzugsweise 60 bis 180 min.The reaction time is 10 to 1000, preferably 60 to 180, minutes.

Die Reaktion wird unter Rühren und in einer Inertgasatmosphäre durchgeführt.The reaction is carried out with stirring and in an inert gas atmosphere.

Die so erhaltenen ansa-Metallocen-Verbindungen der Formel I
[R¹R²Si(indenyl)₂]Me²X₂      (I),
worin R¹, R², Me² und X die oben angegebene Bedeutung haben, können aus aliphatischen und aromatischen Kohlenwasserstoffen sowie etherischen oder halogenhaltigen Lösemitteln umkristallisiert werden. Als besonders günstig erwiesen sich Mischungen aus Chloroform und Hexan.The ansa-metallocene compounds of formula I thus obtained
[R¹R²Si (indenyl) ₂] Me²X₂ (I),
wherein R¹, R², Me² and X have the meaning given above, can be recrystallized from aliphatic and aromatic hydrocarbons and ethereal or halogen-containing solvents. Mixtures of chloroform and hexane have proven to be particularly favorable.

Das erfindungsgemäße Verfahren weist den Vorteil auf, daß die silylverbrückten Metallocen-Verbindungen in der racemischen Form entstehen und keine oder nur sehr geringe Anteile der meso-Form enthalten. Besonders bei der Verwendung der Komplexe als Katalysatoren, wie zum Beispiel in der Polymerisation von α-Olefinen, ist dies von entscheidender Bedeutung, da nur die racemische, nicht aber die meso-Form Stereoselektivität zeigt. Während z.B. rac-[C₂H₄(indenyl)₂]TiCl₂ hochisotaktisches Polypropylen liefert, erzeugt dessen meso-Form nur ataktisches Polymer.The process according to the invention has the advantage that the silyl-bridged metallocene compounds are formed in the racemic form and contain no or only very small proportions of the meso form. This is particularly important when using the complexes as catalysts, for example in the polymerization of α-olefins, since only the racemic form, but not the meso form, shows stereoselectivity. For example, while rac- [C₂H₄ (indenyl) ₂] TiCl₂ provides highly isotactic polypropylene, its meso form only produces atactic polymer.

Alle nachfolgenden Arbeitsoperationen sind in Inertgasatmosphäre unter Verwendung absolutierter Lösemittel durchgeführt worden.All subsequent operations have been carried out in an inert gas atmosphere using absolute solvents.

Beispiel 1example 1 rac-[(Dimethylsilandiyl)bis(η⁵-indenyl)]hafniumdichlorid (rac-[(CH₃)₂Si(indenyl)₂]HfCl₂)rac - [(dimethylsilanediyl) bis (η⁵-indenyl)] hafnium dichloride (rac - [(CH₃) ₂Si (indenyl) ₂] HfCl₂)

Eine Lösung von 18,2 g (63,2 mmol) (CH₃)₂Si(indenyl)₂ in 20 cm³ Diethylether und 30 cm³ Hexan wurde bei Raumtemperatur unter Wasserkühlung langsam mit 52 cm³ (130 mmol) einer 2,5 M Hexan-Lösung von Butyllithium versetzt. Man rührte noch ca. 2 h bei Raumtemperatur und filtrierte den farblosen Niederschlag über eine Glasfritte ab. Nach mehrmaligem Waschen mit Hexan und anschließender Trocknung im Ölpumpenvakuum erhielt man 20,5 g eines farblosen Pulvers, das ca. 85 Gew.-% Li₂[(CH₃)₂Si(indenyl)₂] enthielt (Etherat-Komplex; 92 % d.Th.).A solution of 18.2 g (63.2 mmol) (CH₃) ₂Si (indenyl) ₂ in 20 cm³ diethyl ether and 30 cm³ hexane was slowly at room temperature with water cooling with 52 cm³ (130 mmol) of a 2.5 M hexane solution of butyllithium. The mixture was stirred for about 2 hours at room temperature and the colorless precipitate was filtered off through a glass frit. After repeated washing with hexane and subsequent drying in an oil pump vacuum, 20.5 g of a colorless powder was obtained, which contained about 85% by weight of Li₂ [(CH₃) ₂Si (indenyl) ₂] (etherate complex; 92% of theory) .).

Eine Suspension von 5,40 g (11,5 mmol) HfCl₄·2THF in 80 cm³ Diethylether wurde bei -78 °C mit 4,76 g (13,5 mmol) des Dilithiumsalzes versetzt. Man ließ die Reaktionsmischung unter Rühren langsam auf Raumtemperatur erwärmen, wobei ab ca. -30 °C eine rasche Gelbfärbung einsetzte. Nach 1 h bei Raumtemperatur wurde die Lösung über eine Glasfritte filtriert. Der orangebraune Rückstand wurde mit insgesamt 30 cm³ Chloroform extrahiert. Die orangefarbene Lösung wurde bis zur beginnenden Kristallisation eingeengt. Diese wurde bei -35 °C und Zusatz von Hexan vervollständigt. Insgesamt ließen sich 2,0 g (32 %) rac-[(CH₃)₂Si(indenyl)₂]HfCl₂ in Form orangegelber Kristalle isolieren, die sich bei einer Temperatur über 100 °C allmählich zersetzen.
¹H-NMR-Spektrum (CDCl₃): 7,00-7,57 (m,8,Arom.-H), 6,81 (d,2,β-C₅H₂), 6,04 (d,2,α-C₅H₂), 1,11 (s, 6, Si(CH₃)₂).A suspension of 5.40 g (11.5 mmol) of HfCl₄ · 2THF in 80 cm³ of diethyl ether was mixed with 4.76 g (13.5 mmol) of the dilithium salt at -78 ° C. The reaction mixture was allowed to slowly warm to room temperature with stirring, a rapid yellow color beginning at about -30 ° C. After 1 h at room temperature the solution was filtered through a glass frit. The orange-brown residue was extracted with a total of 30 cm³ of chloroform. The orange solution was concentrated until crystallization began. This was completed at -35 ° C with the addition of hexane. A total of 2.0 g (32%) of rac - [(CH₃) ₂Si (indenyl) ₂] HfCl₂ could be isolated in the form of orange-yellow crystals which gradually decompose at a temperature above 100 ° C.
1 H-NMR spectrum (CDCl₃): 7.00-7.57 (m, 8, Arom.-H), 6.81 (d, 2, β-C₅H₂), 6.04 (d, 2, α- C₅H₂), 1.11 (s, 6, Si (CH₃) ₂).

Beispiel 2Example 2 rac-[(Dimethylsilandiyl)bis(η⁵-indenyl)]zirkondichlorid (rac-[(CH₃)₂Si(indenyl)₂]ZrCl₂)rac - [(dimethylsilanediyl) bis (η⁵-indenyl)] zirconium dichloride (rac - [(CH₃) ₂Si (indenyl) ₂] ZrCl₂)

1,35 g (3,60 mmol) ZrCl₄·2THF und 1,40 g (3,96 mmol) Li₂[(CH₃)₂Si(indenyl)₂)] wurden in 40 cm³ Diethylether analog Beispiel 1 umgesetzt und aufgearbeitet. Man erhielt 350 mg (22 %) rac-[(CH₃)₂Si(indenyl)₂]ZrCl₂]ZrCl₂ als orange Kristalle, die sich bei einer Temperatur über 130 °C allmählich zersetzten.
¹H-NMR-Spektrum (CDCl₃): 7,04-7,60 (m,8,Arom.-H), 6,91 (d,2,β-C₅H₂), 6,08 (d,2,α-C₅H₂), 1,12 (s,6,Si(CH₃)₂).1.35 g (3.60 mmol) ZrCl₄ · 2THF and 1.40 g (3.96 mmol) Li₂ [(CH₃) ₂Si (indenyl) ₂)] were reacted in 40 cm³ diethyl ether analogously to Example 1 and worked up. 350 mg (22%) of rac - [(CH₃) ₂Si (indenyl) ₂] ZrCl₂] ZrCl₂ were obtained as orange crystals which gradually decomposed at a temperature above 130 ° C.
1 H-NMR spectrum (CDCl₃): 7.04-7.60 (m, 8, Arom.-H), 6.91 (d, 2, β-C₅H₂), 6.08 (d, 2, α- C₅H₂), 1.12 (s, 6, Si (CH₃) ₂).

Beispiel 3Example 3 rac-[(Methylphenylsilandiyl)bis(η⁵-indenyl)]hafniumdichlorid (rac-[(CH₃)(C₆H₅)Si(indenyl)₂]HfCl₂)rac - [(methylphenylsilanediyl) bis (η⁵-indenyl)] hafnium dichloride (rac - [(CH₃) (C₆H₅) Si (indenyl) ₂] HfCl₂)

Eine Lösung von 4,60 g (13,12 mmol) (CH₃)(C₆H₅)Si(indenyl)₂, hergestellt aus Indenyllithium und Methylphenyl-dichlorsilan, in 10 cm³ Diethylether und 20 cm³ Hexan wurde bei Raumtemperatur unter Wasserkühlung langsam mit 12 cm³ (30 mmol) einer 2,5 M Hexan-Lösung von Butyllithium versetzt. Man rührte noch 30 min bei Raumtemperatur und entfernte das Lösemittel unter vermindertem Druck. Der hellbraune Rückstand wurde im Ölpumpenvakuum bei 40 °C getrocknet und in 30 cm³ Hexan aufgenommen. Die bräunliche Suspension wurde über eine Glasfritte filtriert. Der hellbraune Rückstand wurde mit Hexan gewaschen und im Ölpumpenvakuum getrocknet. Man erhielt 5,25 g eines beigefarbenen Pulvers, das 90 Gew.-% Li₂[(CH₃)(C₆H₅)Si(indenyl)₂] enthielt (Etherat-Komplex; 99 % d.Th.).A solution of 4.60 g (13.12 mmol) (CH₃) (C₆H₅) Si (indenyl) ₂, made from indenyllithium and methylphenyl dichlorosilane, in 10 cm³ diethyl ether and 20 cm³ hexane was slowly at room temperature with water cooling with 12 cm³ (30 mmol) of a 2.5 M hexane solution of butyllithium. The mixture was stirred for a further 30 min at room temperature and the solvent was removed under reduced pressure. The light brown residue was dried in an oil pump vacuum at 40 ° C. and taken up in 30 cm 3 of hexane. The brownish suspension was filtered through a glass frit. The light brown residue was washed with hexane and dried in an oil pump vacuum. 5.25 g of a beige powder were obtained which contained 90% by weight of Li₂ [(CH₃) (C₆H₅) Si (indenyl) ₂] (etherate complex; 99% of theory).

Eine Suspension von 5,10g (11,0 mmol) HfCl₄·2THF in 100 cm³ Diethylether wurde bei -78 °C mit 5,25 g (13,0 mmol) des Dilithio-Salzes versetzt. Man ließ die Reaktionsmischung innerhalb 10 h auf Raumtemperatur erwärmen und filtrierte sie über eine Glasfritte ab. Der rotbraune Rückstand wurde mit 60 cm³ Diethylether gewaschen. Die vereinigten orangegelben Filtrate wurden unter vermindertem Druck zur Trockne eingeengt. Der verbliebene orangegelbe Rückstand wurde in Toluol aufgenommen. Nach dem Filtrieren und Eindampfen in Vakuum erhielt man 3,1 g (47 % d.Th.) rac-[(CH₃)(C₆H₅)Si(indenyl)₂]HfCl₂ als gelbes Pulver.
¹H-NMR-Spektrum (CDCl₃): 6,6-8,1 (m,13,Arom.-H), 6,8-6,9 (m,2,β-C₅H₂), 6,10 und 6,16 (2xd,2,α-C₅H₂), 1,21 (s,3,SiCH₃).A suspension of 5.10 g (11.0 mmol) of HfCl₄ · 2THF in 100 cm³ of diethyl ether was treated at -78 ° C with 5.25 g (13.0 mmol) of Dilithio salt added. The reaction mixture was allowed to warm to room temperature within 10 h and filtered through a glass frit. The red-brown residue was washed with 60 cm³ of diethyl ether. The combined orange-yellow filtrates were concentrated to dryness under reduced pressure. The remaining orange-yellow residue was taken up in toluene. After filtering and evaporating in vacuo, 3.1 g (47% of theory) of rac - [(CH₃) (C₆H₅) Si (indenyl) ₂] HfCl₂ were obtained as a yellow powder.
1 H-NMR spectrum (CDCl₃): 6.6-8.1 (m, 13, aroma-H), 6.8-6.9 (m, 2, β-C₅H₂), 6.10 and 6, 16 (2xd, 2, α-C₅H₂), 1.21 (s, 3, SiCH₃).

Beispiel 4Example 4

Eine Lösung von 5,60 g (19,4 mmol) (CH₃)₂Si(indenyl)₂ in 100 cm³ THF wurde bei Raumtemperatur unter Wasserkühlung langsam mit 15,5 cm³ (38,7 mmol) einer 2,5 M Hexan-Lösung von Butyllithium versetzt, wobei eine Dunkelrotfärbung einsetzte. Nach 30 min Rühren bei Raumtemperatur wurde die so bereitete Lösung des Dilithio-Salzes bei 0 °C zu einer Suspension von 7,20 g (19,0 mmol) ZrCl₄·2THF innerhalb 6 h zugetropft. Man engte den Ansatz bis zur beginnenden Kristallisation ein, ließ noch weitere 2 h rühren und kühlte auf -35 °C. Der orangefarbene Niederschlag wurde auf einer Glasfritte abfiltrierte und aus Chloroform umkristallisiert. Man erhielt 1,50 g (17 % d.Th.) rac-[(CH₃)₂Si(indenyl)₂]ZrCl₂ als orangefarbene Kristalle.A solution of 5.60 g (19.4 mmol) (CH₃) ₂Si (indenyl) ₂ in 100 cm³ THF was slowly at room temperature with water cooling with 15.5 cm³ (38.7 mmol) of a 2.5 M hexane solution of butyllithium, with a dark red color beginning. After stirring for 30 min at room temperature, the solution of the dilithio salt thus prepared was added dropwise at 0 ° C. to a suspension of 7.20 g (19.0 mmol) of ZrCl₄ · 2THF within 6 h. The mixture was concentrated until crystallization began, the mixture was stirred for a further 2 h and cooled to -35 ° C. The orange precipitate was filtered off on a glass frit and recrystallized from chloroform. 1.50 g (17% of theory) of rac - [(CH₃) ₂Si (indenyl) ₂] ZrCl₂ were obtained as orange-colored crystals.

Claims (2)

1. Verfahren zur Herstellung einer chiralen, stereorigiden Metallocen-Verbindung der Formel I
[R¹R²Si(indenyl)₂]Me²X₂      (I),
worin R¹ und R² gleich oder verschieden sind und eine C₁- bis C₂₀-Alkylgruppe, eine C₂- bis C₂₀-Alkenylgruppe, eine C₆- bis C₂₀-Arylgruppe, eine C₇- bis C₂₀-Alkylarylgruppe oder eine C₇- bis C₂₀-Aralkylgruppe bedeuten, Me² Titan, Zirkon oder Hafnium ist und X ein Halogenatom bedeutet, dadurch gekennzeichnet, daß eine Verbindung der Formel II
[R¹R²Si(indenyl)₂]Me
Figure imgb0004
      (II),
worin R¹ und R² die obengenannte Bedeutung haben und Me¹ ein Alkalimetall ist, mit einer Verbindung der Formel III
Me²X₄      (III),
worin Me² und X die obengenannte Bedeutung haben, bei einer Temperatur von -78 °C bis +25 °C in einem inerten Lösemittel währen 10 bis 1000 min umgesetzt wird.1. Process for the preparation of a chiral, stereorigid metallocene compound of the formula I.
[R¹R²Si (indenyl) ₂] Me²X₂ (I),
wherein R¹ and R² are the same or different and are a C₁ to C₂₀ alkyl group, a C₂ to C₂₀ alkenyl group, a C₆ to C₂₀ aryl group, a C₇ to C₂₀ alkylaryl group or a C₇ to C₂₀ aralkyl group, Me² is titanium, zircon or hafnium and X represents a halogen atom, characterized in that a compound of the formula II
[R¹R²Si (indenyl) ₂] Me
Figure imgb0004
(II),
wherein R¹ and R² have the meaning given above and Me¹ is an alkali metal, with a compound of formula III
Me²X₄ (III),
where Me² and X have the meaning given above, at a temperature of -78 ° C to +25 ° C in an inert solvent for 10 to 1000 min.
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